1 , 2 , 4 , 8 , ?

Add 1 first and then add double of previously added number..

5 , 26 , 131 , 656 , ?

Multiply by 5 and add 1 each time..

M , F , N , G , R , I , S , L , W , P , ?

Two parallel series one with skipping 0 and 3 alphabets alternatively and other with skipping 0 , 1 , 2,....

0 , 1 , 4 , 9 , 16 , 25 , 36 , 49 , ?

Add 1, 3, 5, 7, etc..

Which number is the odd one out, 3, 5, 7, 12, 17, 19

Each of the numbers is a prime number except 12..

N , N , P , L , S , I , W , ?

Two parallel series. One with skipping 1 , 2 , 3,... alphabets in forward order and other with skipping same alphabets in reverse order..

5 , 5 , 3 , -1 , -7 , ?

Subtract 0 ,2 , 4,....

2 , 6 , 15 , 34 , 73 , ?

Multiply with 2 and add 2 , 3 , 4 , 5 , 6,....

12 , 14 , 34 , 36 , 56 , 58 , 78 , ?

Add 2 and 20 alternatively..

7 , 10 , 25 , 94 , 463 , ?

7*2 - 4 = 10!and!10*3 - 5 = 25!and!25*4 - 6 = 94!and!94*5 - 7 = 463!In the same way!463*6 - 8 = 2770.

Which number is the odd one out, 396, 462, 572, 427, 671, 264

In each number except 427, the middle digit is the sum of other two..

180 , 140 , 179 , 138 , 177 , 134 , ?

Two parallel series, one with subtracting 1,2,3,... and other with subtracting 2,4,6,....

0 , 3 , 8 , 15 , ?

Add 3 , 5 , 7,....

AZ , DX , HU , MQ , ?

skip 2 , 3 , 4,... alphabets to find first character and subtract 1 , 2 , 3,... alphabets to find second character..

Which number is the odd one out, 41, 43, 47, 53, 61, 71, 73, 81

Each of the numbers except 81 is a prime number..

Find the odd man out, 3, 5, 11, 14, 17, 21

Each of the numbers except 14 is an odd number.! !The number '14' is the only EVEN number..

100 , 98 , 94 , 88 , 80 , 70 , ?

Deduct 2, 4, 6, 8, 10, 12.

F , G , I , L , P , ?

Skip alphabets 0,1,2,....

20 , 30 , 45 , ?

Multiply previous term with 1.5 to find next term..

6 , H , 9 , K , 11 , M , 14 , P , 16 , R , 19 , U , 21 , ?

Add 3 and 2 alternatively in number series and skip 2 and 1 alphabets alternatively.

C , F , J , O , ?

Skip 2 , 3 , 4,... alphabets..

1/3 , 3/7 , 6/13 , 10/21 , 15/31 , ?

Add 2 , 3 , 4,... in numerator and add 4 , 6 , 8,... in denominator..

Which number is the odd one out, 8, 27, 64, 100, 125, 216, 343

All others are perfect cube of any number but 100 is not the perfect cube of any number..

2 , 20 , 42 , 68 , 98 , ?

Add 18 , 22 , 26 , 30 , 34,....

759 , 675 , 335 , 165 , ?

Each number is formed by multiplying the number formed by the first two digits of the previous number by its third digit.! !So, 16 * 5 = 80.

1 , 1 , 3 , 15 , 105 , ?

Multiply by 1, 3, 5, 7, 9.

XYZ , WVV , VSR , UPN , ?

Subtract 1 from first 3 from second and 4 from third character..

-6 , 9 , -27/2 , 81/4 , -243/8 , ?

Multiply previous term with -3/2 to find next term..

3 , 7 , 2 , 47 , ?

3^2 - 7 = 2!7^2 - 2 = 47!In the same way!2^2 - 47 = -43.

B , D , F , H , J , L , ?

Skip one alphabet..

108 , 189 , 216 , 225 , ?

Add 81 , 27 , 9 , 3,....

1/32 , 1/16 , 1/4 , 1/2 , 2 , 4 , ?

Multiply with 2 and 4 alternatively.

A , B , D , I , ?

Multiply position of previous alphabet with 3 and subtract 1 , 2 , 3,... respectively..

1 , 4 , 2 , 5 , 3 , 6 , 4 , ?

There are two interwoven sequences.! !First starts with 1 and second with 4!Add 1 in both series.

2 , 14 , 32 , 56 , 86 , ?

Add 12 , 18 , 24 , 30 , 36,....

0.67 , 0.69 , 0.48 , 0.88 , 0.29 , 1.07 , ?

There are two series!Subtract 0.19 from the series starting with 0.67 and add 0.19 from the series starting with 0.69..

17 , 34 , 51 , 68 , ?

Add 17 each time..

BZ , EW , HT , KQ , ?

Skip 2 alphabets in forward order to find first alphabet and skip 2 alphabets in reverse order to find 2nd alphabet..

1 , 4 , 9 , 61 , 52 , ?

Square 1 , 2 , 3,... and change the sequence of digits..

Which number is the odd one out, 159, 248, 963, 357, 951, 852 ?

In the rest there is the same difference between each digit! eg 8 (-3) 5 (-3) 2.

F , O , T , W , ?

Skip 8 , 4 , 2 , 1 alphabets..

0 , 100 , 6 , 94 , 12 , 88 , 18 , 82 , ? , ?

There are two sequences interwoven.! !Add 6 starting at 0 and deduct 6 starting at 100..

110 , ? , 99 , 81 , 72 , 63 , 54 , 45

Deduct the sum of the digits of the previous number each time..

B , L , R , T , ?

Skip alphabets 10 , 6 , 2 , -2 , -6,....

1.5 , 3 , 5.5 , 9 , 13.5 , ?

Add 1.5, 2.5, 3.5, 4.5, 5.5.

71 , 25 , 83 , 37 , 95 , 49 , ?

Two parallel series both with adding 12..

9 , 16 , 13 , 13 , 17 , 10 , 21 , 7 , ?

There are two interwoven sequences! !Add 4 starting with 9! !and subtract 3 starting with 16..

1 , 2.65 , 4.3 , 5.95 , 7.6 , ?

1.65 is adding in each term..

1 , 1 , 2.5 , 3.5 , 4 , 6 , 5.5 , 8.5 , ? , ?

There are two interwoven sequences.! !+1.5 starting at the first 1, and +2.5 starting at the second 1..

14 , 16 , 28 , 32 , 42 , 48 , 56 , 64 , ? , ?

There are two interwoven sequences, add 14 starting at 14 and add 16 starting at 16..

2 , 7 , 5 , 5 , 8 , 3 , 11 , ?

Two parallel series one with adding 3 and other with subtracting 2..

1000 , 971.4 , 942.8 , 914.2 , 885.6 , ?

Deduct 28.6 each time..

Which number is the odd one out, 16, 25, 36, 72, 144, 196, 225

Each of the numbers except 72 is a perfect square..

2 , 5.75 , ? , 13.25 , 17 , 20.75

Add 3.75 each time..

3/81 , 4/256 , 5/625 , ?

Add 1 in numerator and in denominator!(3*3)^2 = 81!(4*4)^2 = 256!(5*5)^2 = 625!in the same way!(6*6)^2 = 1296.

0 , 7 , 15 , 24 , 34 , ?

add 7 , 8 , 9 , 10 , 11,....

B , C , E , G , K , ?

Prime numbers 2, 3 , 5 , 7 , 11 , 13,....

7/2 , 4 , 7 , 14 , ?

Multiply previous 2 numbers and divide by 2..

1 , 1 , 2 , ? , 24 , 120 , 720

Multiply by 1, 2, 3 and so on....

A , E , X , H , U , ?

Two parallel series, one with skipping two alphabets in reverse order and other with skipping two alphabets in forward order.

5 , 2.5 , 1.25 , 0.625 , ?

Divide previous term with 2 to find next term..

100 , 96.75 , 93.5 , 90.25 , 87 , ?

Deduct 3.25 each time..

7 , 12 , 19 , 28 , ?

add 5 , 7 , 9 , 11,....

63 , 35 , 15 , 3 , ?

8^2 - 1 = 63!and!6^2 - 1 = 35!and!4^2 - 1 = 15!and!2^2 - 1 = 3!in the same way!0^2 - 1 = -1.

3 , 6 , 9 , 12 , 15 , ?

Add 3 in previous term to find next term..

9 , 18 , 27 , ? , 45 , ? , 63

Add 9 each time..

8 , 16 , 32 , 64 , 128 , ?

Multiply previous term with 2 to find next term..

T , Q , M , H , ?

Skip 2 , 3 , 4,... alphabets in reverse order..

6 , 8 , 10 , 14 , 18 , 26 , 34 , 50 , 66 , ?

Add 2, 4, 4, 8, 8, 16, 16,....

O , P , R , U , ?

Skip 0 , 1 , 2 , 3,... alphabets..

Which number is the odd one out, 331, 482, 551, 263, 383, 362, 284

In each number except 383, the product of first and third digits is the middle one..

E , H , K , N , Q , T , ?

Skip two alphabets..

6 , 10 , 18 , 34 , 66 , ?

Add 4 , 8 , 16 , 32,....

B , D , G , K , P , ?

Skip 1 , 2 , 3,... alphabets..

C , F , K , R , ?

Skip 2 , 4 , 6 , 8,... alphabets.

Which two letters come next in the sequence A , D , I , P , Y , CF , DI , FD , ?

take the numerical position of each letter in the alphabet to reveal the sequence of consecutive square numbers 1, 4, 9, 16, 25, 36, 49, 64, 81.

36 , 72 , ? , 144 , 180 , 216 , 252

Add 36 each time..

156 , 76 , 36 , 16 , ?

Subtract 4 from previous term and then divide it with 2 to find next term..

3.4 , 6.3 , 9.2 , 12.1 , 15 , ?

Add 2.9 in previous term to find next term..

Which number is the odd one out, 6, 9, 15, 21, 24, 28, 30

Each of the numbers except 28, is a multiple of 3..

Which number is the odd one out, 2, 5, 10, 17, 26, 37, 50, 64

(1*1)+1 , (2*2)+1 , (3*3)+1 , (4*4)+1 , (5*5)+1 , (6*6)+1 , (7*7)+1 , (8*8)+1! !But, 64 is out of pattern..

3925 and 277 , 4697 and 2416 , 6257 and ?

3 * 9 = 27! 5 + 2 = 7!(277).! !4 * 6 = 24!and 9 + 7 = 16!(2416)! !Similarly,!6 * 2 = 12!and 5 + 7 = 12!(1212).

1 , 2 , 3 , 5 , 7 , 10 , 13 , 17 , 21 , ? , ?

+1, +1, +2, +2, +3, +3, +4, +4, +5, +5.

87 , 102 , 119 , 138 , 159 , ?

Adding 15 , 17 , 19,....

7964325 is to 6975234 , 5822139 is to 2859312 as 7469851 is to ?

Reverse the first three digits then reverse the last four digits..

17 , 20 , 19 , 22 , 21 , 24 , 23 , ?

Add 3 and subtract 1 alternatively..

O , R , M , T , K , V , I , ?

Two parallel series one with skipping one alphabet in reverse order and other with skipping one alphabet in forward order..

25 , 50 , 27 , 46 , 31 , 38 , 39 , ?

There are two interwoven sequences.!Add 2, 4 and 8 from the sequence starting with 25!and subtract 4, 8 and 16 from the sequence starting with 50.

B , W , F , P , M , E , ?

Two parallel series one with skipping 3 , 6,... alphabets and other with skipping 6 , 12,... alphabets..

7 , 13 , 24 , 45 , 86 , ?

Multiply previous term with 2 and subtract 1 , 2 , 3,... to find next term..

78214 and 292 , 38421 and 459 , 69517 and ?

78 + 214 = 292!38 + 421 = 459! !So, 69 + 517 = 586.

100 , 97 , 91 , 82 , ?

-3 , -6 , -9 , -12!(Multiples of 3 are subtracted).

100 , 50 , 200 , 25 , 400 , ?

There are two interwoven sequences.! ! Multiply 2 starting at 100 and devide by 2 starting at 50..

64521 is to 41256 as 38297 is to..

A B C D E!6 4 5 2 1! !B E D C A!4 1 2 5 6! !A B C D E!3 8 2 9 7! !B E D C A!8 7 9 2 3.

2 , 6 , 18 , 54 , 162 , ?

Multiply previous term with 2 to find next term..

Which number is the odd one out, 1, 4, 9, 16, 23, 25, 36

Each of the numbers except 23, is perfect square..

Which is the odd number out, 9421 , 7532 , 9854 , 8612 , 6531 , 8541 ?

All the other numbers have their digits in descending order..

Which number is the odd one out, 835, 734, 642, 751, 853, 981, 532

In each number except 751, the difference of third and first digit is the middle one..

Which number is the odd one out, 10, 25, 45, 54, 60, 75, 80

Each of the numbers except 54 is multiple of 5..

Which number is the odd one out, 10, 14, 16, 18, 21, 24, 26

All numbers are even except 21..

3 , 10 , 33 , 104 , ?

Multiply with 3 and add 1, 3, 5, 7,....

A , Y , W , U , S , Q , ?

Skip one alphabet in reverse order..

9 , 11 , 17 , 35 , ?

Add 2 , 6 , 18 , 54,...!here!6 = 2*3!18 = 6*3!and!54 = 18*3.

492 , 366 , 189 , 810 , ?

8 * 1 = 8, 8 + 0 = 8.

2 , -1 , 2 , -1 , 2 , ?

Subtract and add 3 alternatively..

4 , 7 , 15 , 29 , 59 , 117 , ?

Multiply with 2 and subtract and add 1 alternatively..

C , G , L , R , ?

Skip 3 , 4 , 5,... alphabets..

100 , 1 , 97.5 , 3.5 , 92.5 , 8.5 , 85 , 16 , ? , ?

There are two interwoven sequences.! ! subtract 2.5, 5, 7.5 starting at 100 and Add 2.5, 5, 7.5 starting at 1..

2 , 5 , 10 , 17 , 26 , ?

add 3 , 5 , 7 , 9 , 11,....

Which number is the odd one out, 1, 4, 9, 16, 20, 36, 49

All other numbers are perfect square of numbers but 20 is not perfect square of any number..

X , U , Q , N , J , G , ?

Skip 2 and 3 alphabets alternatively in reverse..

F , I , M , P , T , W , ?

Skip 2 and 3 alphabets alternatively..

What four-digit number should replace the question mark? 4342 (3176) 1726, 7995 (7516) 2162, 8418 (????) 1725

Delete the digits outside the brackets that appear twice, and insert the remaining digits in the brackets in the same order that they appear outside the brackets!8418 (4725) 1725.